(288e) Crystal Features Controlling Oxygen Vacancy Formation in ABO3 Perovskites
AIChE Annual Meeting
2022
2022 Annual Meeting
Topical Conference: Sustainable Pathways Toward Hydrogen and Synthetic Fuels
Sustainable Pathways to Clean Hydrogen and Synthetic Fuels I
Tuesday, November 15, 2022 - 9:40am to 10:05am
The control of oxygen vacancy (VO) formation could unlock significant advances in metal oxide technologies including solar thermochemical fuel production. Despite the critical role played by VOs in determining the performance of such metal-oxide-based processes, and the research attention they have garnered over the past few decades, an optimally simple, instructive, and efficient model for their quantitative assessment has been elusive. Here, we introduce a compact linear model for the VO formation energies of ABO3 perovskites, where A = {Ca, Sr, Ba, Ce, and La} and B = {Ti, V, Cr, Mn, Fe, Co, and Ni}, in six lattice systems (monoclinic, orthorhombic, tetragonal, rhombohedral, hexagonal, and cubic). The model takes as inputs crystal bond dissociation energies, crystal reduction potentials, band gaps, and energies above the convex hull, which can be obtained from theoretical or experimental databases. Additionally, we demonstrate that the model can be simplified, with acceptable losses in accuracy, such that only crystal bond dissociation energies and crystal reduction potentials are needed. Finally, we present our perspectives on how to improve and extend the model, which already provides both accurate and efficient predictions for high-throughput screening and an intuitive and modular phenomenology for renewable energy applications of metal oxide perovskites and beyond.
Wexler, R. B.; Gautam, S. G.; Stechel, E. B.; Carter, E. A. Factors Governing Oxygen Vacancy Formation in Oxide Perovskites. J. Am. Chem. Soc. 2021, 143 (33), 13212-13227. https://doi.org/10.1021/jacs.1c05570